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Re:Rare Greek Variables by seliopou on Saturday November 27, 2021 @11:17PM (#29366121)
There is a reason Ξ is not used, at least as a complex variable. Say you wanna take the complex conjugate of Ξ. What would that look like? Now say you wanted to divide that by, say, Ξ. What would that look like?

It looks like a mess of lines is what it looks like.

Re:Rare Greek Variables by jacobolus on Sunday November 28, 2021 @12:47AM (#29366513)
> complex conjugate of Ξ [...] divide that by, say, Ξ

This is not a real concern; it was done by Barry Mazur as a joke, hoping to provoke Serge Lang into using his catchphrase "this notation sucks", so Mazur could present him with a prepared "This Notation Sucks" tee-shirt. See the Paul Vojta section of http://www.ams.org/notices/200605/fea-lang.pdf

Re:Rare Greek Variables by mbg721 on Saturday November 27, 2021 @11:26PM (#29366151)
In before 王 becomes a thing.
Re:Rare Greek Variables by labster on Sunday November 28, 2021 @12:43AM (#29366494)
主 - U+4E3B MATHEMATICAL XI BAR WITH GRAVE ACCENT
Re:Rare Greek Variables by dustintrex on Sunday November 28, 2021 @12:54AM (#29366548)
国 U+56FD CONTAINERIZED PRODUCTION READY MATHEMATICAL XI BAR WITH SUBPRIME INDICATOR
Re:Rare Greek Variables by mbg721 on Sunday November 28, 2021 @08:12AM (#29368642)
We haven't given the actuaries enough time, they'd slap an umlaut on there, and then we're good to go.